US2833888A - Circuit breakers - Google Patents

Circuit breakers Download PDF

Info

Publication number
US2833888A
US2833888A US640231A US64023157A US2833888A US 2833888 A US2833888 A US 2833888A US 640231 A US640231 A US 640231A US 64023157 A US64023157 A US 64023157A US 2833888 A US2833888 A US 2833888A
Authority
US
United States
Prior art keywords
lever
spring
contacts
circuit
axle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US640231A
Other languages
English (en)
Inventor
Bessiere Pierre Etienne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Electrical and Power SAS
Original Assignee
Labinal SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Labinal SA filed Critical Labinal SA
Application granted granted Critical
Publication of US2833888A publication Critical patent/US2833888A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/58—Manual reset mechanisms which may be also used for manual release actuated by push-button, pull-knob, or slide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • the present invention relates to circuit-breakers, that is to say apparatus intended to open a circuit automatically when the current in this circuit rises in excess of a predetermined value.
  • the object of my invention is to provide a circuitbreaker which is better adapted to meet the requirements of practice than those known at the present time.
  • the principle of my invention consists in controlling the resetting of the circuit-breaker by means of a lever the axis of which may be given a translatory displacement in a direction substantially at right angles to itself, said lever remaining constantly free to rotate about said axis.
  • Fig. 1 is a diagrammatical view showing the main elements of a circuit-breaker made according to my invention, said circuit-breaker being shown in the position Where the circuit is opened.
  • Fig. 2 is a view similar to Fig. 1 showing the circuitbreaker after resetting thereof.
  • Figs. 3 and 4 show, respectively in section on the line III-III of Fig. 4 and in section on the line IV-IV of Fig. 3, a circuit-breaker made according to an embodiment of my invention, in a position corresponding to that illustrated by Fig. 1.
  • Figs. 5 and 6 show, respectively in section on the line VV of Fig. 6 and in section on the line VI-VI of Fig. 5, the same circuit-breaker in reset position, corresponding to that illustrated by Fig. 2.
  • Fig. 7 is a sectional view on the line VII-VII of Fig. 5.
  • Figs. 8 to 11 inclusive are elevational views of different forms of an element of the circuit-breaker, according to my invention.
  • Figs. 12 to 14 are elevational views of different forms of another element of the circuit-breaker according to my invention.
  • Fig. 15 is a vertical sectional view on the line XV-XV of Fig. 18 of another embodiment of the circuit-breaker made according to my invention.
  • Fig. 16 is an elevational view of the circuit-breaker of Fig. 15, the casing of this circuit-breaker being removed.
  • Fig. 17 is a part sectional view on the line XVII-XVII of Fig. 15.
  • Fig. 18 is a cross sectional view, with the casing removed, on the line XVIIIXVIII of Fig. 16.
  • Fig. 19 is a part vertical sectional view on the line XIX--XIX of Fig. 20.
  • Fig. 20 is a sectional view with the casing removed, on the line XXXX of Fig. 19.
  • Fig. 21 is a sectional view seen from bottom on the line XXIXXI of Fig. 19.
  • Fig. 22 is a plan view with the casing partly removed of the circuit-breaker of Fig. 19.
  • Fig. 23 is a vertical sectional view on the line XH'II- XXIII of Fig. 22.
  • Fig. 24 is an elevational view of still another embodiment of the contacts and of the supporting part of a circuit-breaker made according to still another embodiment.
  • Fig. 25 is a corresponding plan view with parts cut away.
  • Fig. 26 is a sectional view on the line XXVI-XXVI of Fig. 24.
  • Fig. 27 is a vertical sectional view on the line XXVII- XXVII of Fig. 28 showing a mechanism for quick release or" the circuit-breaker.
  • Fig. 28 is a part elevational view corresponding to Fig. 27.
  • Fig. 29 is a part sectional view of a modification of such a mechanism.
  • Fig. 30 shows a modification of a portion of the contact supporting means.
  • the apparatus according to my invention is arranged in such manner that the forces applied when the circuitbreaker is reset are exerted by the operator upon a lever exclusively through the pivot axle thereof, this lever being free to rotate about the axis of said axle whatever he the value of these forces.
  • Such an arrangement facilitates free tripping of the circuit-breaker, that is to say, in the case of a current exceeding a predetermined value, automatic opening of the circuit as soon as the contacts have been closed by a resetting operation, even if the operator keeps acting upon the control member and for instance holds his finger on a push-button.
  • a control member 1 such as a push-button is used to displace the pivot axle 2 of a lever 3 the functions of which will be more explicitly referred to hereinafter.
  • this axle is advantageously mounted slida'ble with a translatory motion in two grooves of a width substantially equal to the diameter of said axle, one of said grooves being fixed and the other movable, and said grooves being capable of cooperating for guiding said axle.
  • I will include under the term of groove, also the case of two or more grooves provided in dilferent elements located opposite each other, such as the walls of a hollow button or two parallel plates.
  • the movable groove 4 (Figs. 1 and 2) provided in control member 1 is given a shape substantially elongated in the direction perpendicular to the displacements of this member; and the fixed groove 5 which is provided in the frame 6 of the apparatus is given the shape of an L, that is to say is elongated in the direction of said displacements and provided at one of its ends with a notch 6 substantially perpendicular to this direction.
  • Groove 4 is then substantially transverse and groove 5 has the longer branch of the L it forms longitudinally disposed.
  • the grooves used to guide the displacements of the lever pivot axle might be given shapes differing from those above stated.
  • the movable control member in the movable control member a groove parallel to the direction of the displacement. thereof and which opens into the above mentioned groove 4, at the end thereof where is located the notch 6 of the fixed groove, thus forming a substantially L-shaped movable groove.
  • the two L shaped grooves i. e. the fixed one and the movable one, have their longer branches parallel to each other and extending in the same direction and their shorter branches parallel and extending in opposed directions.
  • I might also control and guide the displacements of said axle through means other than grooves, such as forks cooperating with cams or any other suitable system.
  • Said lever 3 has one of its ends 7 constituted by a nose capable of cooperating with an abutment 8 retractable when the current in the circuit exceeds a predetermined value, the other end 9 of said lever being adapted to move, in particular through a roller 9 freely rotatable thereon, upon a part 10-which operates the contacts.
  • said lever 3 may be constituted by two parallel plates assembled together and between which roller 9 is journalled, resilient return means such as a torsional spring 2 being mounted about axle 2' and bearing upon abutments. 2 2
  • the abutment member 8 is pivoted about a fixed axis 11 parallel to the axis of the lever pivot axle and advantageously its surface intended to cooperate with the nose 7 of lever 3 is given a smooth cylindrical shape concentric with said .axis 11..
  • the force exerted by lever 3 on said abutment member therefore passes constantly through said. axis 11, which avoids the creation of any disturbing couple of forces when the circuit-breaker is tripped into circuit opening position.
  • This abutment member are controlled throughmeans responsive to the occurrence of a current above a predetermined value in the circuit, such means being for instance constituted by an electromagnet or a bimetallic strip (such a strip being shown at 12).
  • I provide resilient return means, such as a plate spring 13 adjustable by means of a screw 13,, to urge abutment member '8 toward its position of rest, and an element 14 for limiting the displacements of said member.
  • the part 10 which actuates the contacts is constituted by a lever pivoted about a fixed axis 15 parallel to the axis of the pivot axle 2 of lever 3 and subjected to the action of resilient return means such as a helical compression spring 16.
  • the arm of this lever lfl which is to cooperate with the end 9 (or rather roller 9 of lever 3 carries a cam which is advantageously a flexible cam, such as a resilient U-shaped plate 17 the shape of which is adjustable by means of a screw 18 carried by the above mentioned lever arm.
  • I mount in resilient fashion one or several movable contacts 19 capable of cooperating with corresponding fixed contacts 26 and, therefore, of opening or closing an electric circuit.
  • a resilient mounting is for instance obtained by controlling through a plate spring 21 the sliding displacements (Fig. 2) or pivoting displacements (Fig. 5) of the movable contacts.
  • I further provide relatively powerful resilient means to urge the control member toward its position of rest, in particular a helical compression spring 23 hearing on the one hand upon a fixed rigid support 24 and on the other hand upon push-button 1 so as to oppose the downward movement thereof.
  • Said rigid support 24, made of relatively small dimensions, is advantageously used as a bracing member used for assembling side plates 22' together and as a support for the fixed contacts 20 and the bimetallic strip 12.
  • Fig. 7 shows the arrangement of the conductorand contact elements of the circuit-breaker.
  • Fig. 1 indicates the position of the parts of the apparatus just when said apparatus has been tripped open, whereas on Figs. 3 and 4, the abutment member 8 has already been able to return to its-'- position of rest.
  • the apparatus will be supposed to be vertical; In thecircuitopening position, push-button 1 is in its upper position and-the axle 2 of lever 3 is located at the top of the fixed groove 5.
  • lever 3 When push-button 1 is further moved down, lever 3 is compelled to pivot about its axis and therefore to pushback, due" to the contact of roller 9 with plate 17, the
  • This force F is adjusted so that tripping of the circuit-breaker takes place sufficiently sharply.
  • push-button 1 may be released, said button remaining in the depressed position.
  • bimetallic strip 12 is deformed and exerts on abutment member 8 a force opposed to that of spring 13.
  • the pressure exerted by nose 7 on said abutment member is small and the surface of contact between these elements is such that there is but little friction (which makes the apparatus sensitive), said member can easily pivot about,
  • lever 3 turns under the combined effects of adjustable force F of spring 2 and possibly of a difierence between the weights of the respective branches of lever 3 on the opposed sides of the pivot axis thereof.
  • abutment member 8 If the current in the circuit is above a predetermined limit, abutment member 8 is automatically retracted, which compels lever 3, subjected to the above mentioned forces, to pivot and to cut off the electric contacts, whatever be the distance to which button 1 has been depressed and even if the operator keeps his finger applied on said button, since, as above stated, the force thus exerted on button 1 is exerted exclusively upon the pivot axis of lever 3 and does not prevent said lever from oscillating about said axis.
  • tripping of the circuit-breaker into open position may be obtained manually by pulling button 1 upwardly so as to disengage axle 2 from notch 6 and to compel lever 3 to release lever 10 without abutment member 8 having to be displaced.
  • the critical value of the current flowing through the circuit for which the apparatus is to trip open is adjusted by acting upon the force of spring 13 by means of screw 13
  • the sharpness orf the tripping operation may be adjusted by modifying the angular position of plates 17 by means of screw 18.
  • Figs. 8 to 11 and also Figs. and 19 show various embodiments of the abutment member 8 which is: either mounted directly upon a spring plate 13 (Fig. 8) or on the bimetallic strip 12 which itself constitutes a spring 13 (Fig. 9); or pivotally mounted about a fixed axis 11 (Figs. 10, 11, 15 and 19), spring 13 being preferably applied upon a rounded portion 25 of this abutment member.
  • Spring 13 is for instance a plate spring (Figs. 10, 11 and 15), or a torsional helical spring (Fig. 19).
  • Adjustment of the efforts exerted upon abutment 8 is preferably obtained, when said abutment is pivotally mounted, by means of a screw 12 acting directly upon the inclination of bimetallic strip 12, or simultaneously by means of a screw such as 12 acting upon bimetallic strip 12 and of a screw such as 13 acting upon spring 13 (see for instance Figs. 18 and Contact between abutment 8 and bimetallic strip 12 is effected by means of a part made of insulating material such as a head of steatite 26 (Figs. 8, 10 and 11) or a glass ball 27 (Fig. 15).
  • abutment 8 is made of two disymmetrical portions, one 8 (Figs. 19 and 20), made of metal, capable of acting efficiently as an abutment for the nose 7 of lever 3 and the other 8 made of an insulating material on which spring 13 and bimetallic strip 12 can be applied directly.
  • the bimetallic strip In order to obtain that under the effect of the excess of current to which it is subjected, the bimetallic strip is sufficiently deformed, it may be constituted by juxtaposing several bimetallic strips connected either in series or in parallel (Fig. 15) or, preferably, by a single suf ficiently long. bimetallic strip (Fig. 19) on which can bemounted in parallel shunts 12 of shapes and/ or dimensions variable with theintensities for which tripping of the apparatus is desired.
  • Figs. 12 to 14 and also Figs. 15 and 19 show various embodiments of the contact carrying lever 10 for which:
  • Spring 16 is constituted by a helical spring (Fig. 12),
  • a plate spring (Figs. 13 and 14) or a torsional spring 1 (Figs. 15 and 19), in particular such as hereinafter described;
  • Spring 21 (which applies the movable contacts '19 against fixed contacts 20) is constituted by a spring plate (Figs. 12 and 13) one end of which is fixed on lever 10 and the other end of which carries the movable contacts 19, said spring 21 hearing against a rigid extension 10 of lever 10; or said spring is a torsional spring (Figs. 14,15 and 19).
  • a particularly advantageous construction of these springs 16 and 21 consists in constituting both of them by a single double torsional spring (Figs. 15 and 19), for instance made of stainless piano string, consisting of two identical halves coaxial to each other and the contiguous ends of which are joined so as to constitute spring 16 the end portions thereof constituting the spring 21.
  • FIG. 14 Another interesting characteristic of the invention, illustrated 'by Figs. 14, 15 and 17, consists in mounting part 19 which is rigid with the movable contacts 19, in such manner that it can move in all directions with respect to lever 10 and thus suitably distribute the pressure of movable contacts 19 on the corresponding fixed contacts 20.
  • an orifice 28 (Fig. 14) which is for instance of square or rectangular outline, in which a finger 29 rigid with lever 10 is engaged wit-h some play. Part 19 is then made to pivot about the shoulder 29 of this finger when contacts 19 are applied against contacts 2t), against the action of spring 21. The point of pivoting of the movable contact being thus close to said contact, I thus obtain a better rolling displacement thereof.
  • I may also provide an aperture 30 in a molded piece constituting lever 10 (Fig. 15) and part 19 is provided with a bracing part 31 (Figs. 15 and 17) including a convex portion 31 which engages into aperture 30, so as to permit all angular displacements of part 19 with respect to lever 10.
  • torsional spring 1621 is insulated from contacts 19 on which it is applied by means of insulating lugs 32 pivotally mounted on axis 15', whereas in the construction of Fig. 19, said spring is insulated from the central terminal 24 by means of an insulating plate 24 riveted thereon.
  • edges of the metal side plates 33 act as abutments for lever 10 in the em bodiment of Figs. 15 and 16.
  • the part 34 which controls the displacements of the axle 2 of lever 3 may be screwed in push-button 1 (Fig. 15) or inversely, and the whole may be mounted slidable in a metallic sheath 35.
  • the casing of the apparatus may be made of a single molded piece 36 (Fig. 15) adapted to fit on a base 37; or it may include a cover 38 (Figs. 19, 22 and 23) fixed on the mechanism by means of nuts 39 (Figs. 22 and 23) adapted to fit on bolts 40 caught in this mechanism, these nuts being for instance disposed at two opposite corners of cover 38 and covered with a protection varnish 41.
  • the walls of said casing may advantageously be established by cutting tubular elements of suitable length from a continuous tube of rectangular cross-section, for instance made of a polyester resin reinforced by means of a glass fabric.
  • the central terminal 24 may be fixed by means of screws on the base 37 instead of being caught in this base by molding (Fig. 15).
  • the terminals may be fixed by screws 42 the head of which is located inside the casing (Fig. 19).
  • anannular jacket 43 preferably metallic, mounted around said push-- button.
  • the transverse groove 4 (Fig. l) rigid with the'pushw button 1 and the cooperation of which with fixed groove permits of imparting the desired displacements to axle 2 may, instead of being constituted by a groove formed inpart 34, be merely formed by the recess common to' said fixed groove 5 and to the hollow portion of a kind of'hoo-k 44 (Fig. 19) forming. an extension of said part 34' at its lower end, when said push-button is suitably depressed.
  • I may interpose between these two pieces I rollers 45 (Fig. 19), for instance of-brass or of stainless steel, so as to reduce wear and tear.
  • every movable contact 19 and every fixed contact 20 are made to include a system of two elementary contacts, one made of silver (19 20 and the other of tungsten (19 20 I dispose these elementary contacts on at least some of which resilient means 46 are acting, in such manner that, in the state of-rest, the silver elements are at a greater distance from one another than the tungsten-elements are, the difference (or play j) between these intervals being for instance of about 0.5 mm.
  • the elementary tungsten fixed contact 20 is fixed on one side of the silver fixed contact 20 and projectstherefrom by about 0.5 mm.
  • the whole of the movable contacts is mounted in accordance with the principle applied in theconstruction of Fig. 14. Thus it may move about an axis 46 which is rigid with respect to a stirrup-shaped member 47 which itself rotates about axis together with a piece 48 including the above mentioned'oblique surface 17.
  • spring 16 is a double torsional spring the curved ends 50 of which are engaged in the side plates of the apparatus, wound on insulating rings 51 on either side of piece 48
  • spring 21 is constituted by the combination of a spring and a counter-spring both of flap shape (21, and 21 applied againsteach other and riveted together on part 47 by means of a rivet 52.
  • Spring 21 is established in such manner as to exert a stronger pressure upon the silver contact element 19 than upon the tungsten contact element 19 for instance due to its shape, the distance a (Fig.
  • the silver elements are first moved away from each other, then the'tungsten elements, in view of the fact that the shaft 46 drives first the silver contact as'it is catching up the -play-provided in the tungsten contact element.
  • the contact elements are-- not deteriorated by: sparks;
  • part 34 is connected with thepush-button 1 by meansof a pin 53caught in said button-1 and extending through anelongated aper--- ture- 54 ofsaid part 34.
  • spring 23 which' bears on the one hand upon push-.
  • rollers and means- -59 consist of a fiat spring screwed on the frame of-the apparatus betweena screwhead 60 and a spacing ring 61serving to increase the flexibility of said spring.
  • elements 58 are balls and means 59 are constituted by helical compression springs.
  • Another-way of obtaining a sudden closing of the contact consists in givinginclined surface 17 a shape I such that, when it is attacked by roller 9 the angles between the lines extending between the point'of attack- 64 on the respectivepivot axes -of'the roller and of surface 17 is close to-l".
  • a circuit-breaker which comprises-in combination, a frame, two -fixed-contacts insulated from each othercarried by said frame, a switching-part, movably carried by said frame, two movable contacts, electrically con nected to each other, carried by said part arranged, to be applied, for one position of said part in said frame,
  • a lever having a pivot axle movably' guided in said frame with a translatory movement transverse to said pivot axle, said lever. being freely pivotable with respect to said frame about the axis of said pivot axle, a control member operatively'conuectedwith said lever pivot axle for imparting, thereto said translatory movement in one direction, resilient means interposed between said control member andsaid frame for opposing movement of said member in said direction, abutment means carried by said frame adapted to cooperate with said lever for causing it to pivot about the axis of said pivot axle when said pivot axle is moved in said direction by said control member, means carried by said lever for engaging said switching part when said lever is thus pivoted and then moving said part into the above mentioned position thereof, whereby said fixed contacts are interconnected, and means carried by said frame and electrically inserted between said two fixed contacts, said means being responsive to variations of the electric current flowing between said contacts, for retracting said abutment means from the path of said lever when said current rises in excess of
  • control member and said frame are provided with two grooves for guiding said lever pivot axle, the groove provided in said control member extending transversely to the direction of displacement of said control member, the groove provided in said frame having a width substantially equal to the diameter of said pivot axle and extending in said direction of displacement, the end of said last mentioned groove toward which said axle is moved when said lever is displaced by said control member forming a notch at right angles to said direction for accommodating said axle in order to hold it in the position for which the contacts are closed when the current is normal.
  • a circuit-breaker which comprises, in combination, a frame, two fixed contacts insulated from each other carried by said frame, a switching lever pivotally mounted on said frame, two movable contacts, electrically connected to each other, carried by said lever arranged, to be applied, for one position of .said lever in said frame, against said fixed contacts respectively for electrically interconnecting them, a lever having a pivot axle parallel to the pivot axis of said first mentioned lever, said pivot axle being movably guided in said frame with a translatory movement transverse to said pivot axis, said lever being freely pivotable with respect to said frame about the axis of said pivot axle, a control member operatively connected with said lever pivot axle for imparting thereto said translatory movement in one direction, resilient means interposed between said control member and said frame for opposing movement of said member in said direction, abutment means carried by said frame adapted to cooperate with said second mentioned lever for caus- 10 for engaging said switching lever when said second mentioned lever is thus pivoted and then moving said switching lever into the above mentioned position thereof,
  • each of said contacts includes two contact elements disposed side by side and made of different materials, the contact element of one material of one movable contact being arranged to cooperate with the contact element of the same material of the corresponding fixed contact and at least one contact of each pair of cooperating contacts having its elements resiliently mounted so that the two elements of one material separate from each other, when the contacts are moved away from each other, before the two elements of the other material separate from each other.
  • An apparatus further including a transmission member directly connected with said lever, resilient means interposed between said transmission member and said control member whereby movement of said control member is transmitted to said lever in a resilient fashion through said transmission member, and means for yieldingly preventing said transmission member from moving in response to the movements of said control member so that the movement of said transmission member which takes place when said last mentioned means have yielded is very sudden.

Landscapes

  • Breakers (AREA)
US640231A 1956-02-18 1957-02-14 Circuit breakers Expired - Lifetime US2833888A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1083412X 1956-02-18

Publications (1)

Publication Number Publication Date
US2833888A true US2833888A (en) 1958-05-06

Family

ID=9611141

Family Applications (1)

Application Number Title Priority Date Filing Date
US640231A Expired - Lifetime US2833888A (en) 1956-02-18 1957-02-14 Circuit breakers

Country Status (4)

Country Link
US (1) US2833888A (fr)
DE (1) DE1083412B (fr)
FR (3) FR1142759A (fr)
GB (1) GB854484A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955177A (en) * 1958-07-08 1960-10-04 Wood Electric Co Inc Circuit breaker
US2958749A (en) * 1958-03-13 1960-11-01 Wood Electric Corp Electrical circuit breakers
US2960587A (en) * 1959-01-13 1960-11-15 Wood Electric Corp Trip-free overload circuit breaker
US3021404A (en) * 1959-10-09 1962-02-13 Wood Electric Corp Heat responsive wire controlled overload circuit breaker
US3042776A (en) * 1959-09-16 1962-07-03 Texas Instruments Inc Electrical switches
US3683140A (en) * 1971-05-21 1972-08-08 Square D Co Canada Ltd Electric circuit breaker with arc current shunting blade stacked on contact blade

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1133805B (de) * 1960-11-17 1962-07-26 Licentia Gmbh Mechanismus fuer Installations-Selbstschalter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2287875A (en) * 1939-10-25 1942-06-30 Westinghouse Electric & Mfg Co Circuit breaker
US2467653A (en) * 1944-02-16 1949-04-19 Berthier Emile Andre Electric cutout
US2613296A (en) * 1949-06-24 1952-10-07 Morris B Wood Trip-free circuit breaker
US2686241A (en) * 1951-10-13 1954-08-10 Joseph E Straub Thermally operated electrical circuit breaker
US2701829A (en) * 1951-08-03 1955-02-08 Cutler Hammer Inc Manually operable circuit breaker
US2768262A (en) * 1954-05-31 1956-10-23 Allard Georges Electric cut-out switches

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE655864C (de) * 1935-06-20 1938-01-24 Kostal Fa Leopold Installationsselbstschalter
BE509828A (fr) * 1951-03-27

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2287875A (en) * 1939-10-25 1942-06-30 Westinghouse Electric & Mfg Co Circuit breaker
US2467653A (en) * 1944-02-16 1949-04-19 Berthier Emile Andre Electric cutout
US2613296A (en) * 1949-06-24 1952-10-07 Morris B Wood Trip-free circuit breaker
US2701829A (en) * 1951-08-03 1955-02-08 Cutler Hammer Inc Manually operable circuit breaker
US2686241A (en) * 1951-10-13 1954-08-10 Joseph E Straub Thermally operated electrical circuit breaker
US2768262A (en) * 1954-05-31 1956-10-23 Allard Georges Electric cut-out switches

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958749A (en) * 1958-03-13 1960-11-01 Wood Electric Corp Electrical circuit breakers
US2955177A (en) * 1958-07-08 1960-10-04 Wood Electric Co Inc Circuit breaker
US2960587A (en) * 1959-01-13 1960-11-15 Wood Electric Corp Trip-free overload circuit breaker
US3042776A (en) * 1959-09-16 1962-07-03 Texas Instruments Inc Electrical switches
US3021404A (en) * 1959-10-09 1962-02-13 Wood Electric Corp Heat responsive wire controlled overload circuit breaker
US3683140A (en) * 1971-05-21 1972-08-08 Square D Co Canada Ltd Electric circuit breaker with arc current shunting blade stacked on contact blade

Also Published As

Publication number Publication date
GB854484A (en) 1960-11-16
FR71243E (fr) 1959-10-30
FR71867E (fr) 1960-02-01
DE1083412B (de) 1960-06-15
FR1142759A (fr) 1957-09-23

Similar Documents

Publication Publication Date Title
US3307002A (en) Multipole circuit breaker
US2625625A (en) Free trip circuit breaker
US3081386A (en) Circuit breakers
US2833888A (en) Circuit breakers
US2661414A (en) Electric circuit breaker
US3550049A (en) Current limiting circuit breaker with electrodynamic compensation
US2741681A (en) Electrical circuit-breakers
US2783330A (en) Automatic circuit breaker
US2878332A (en) Multiple circuit breaker
US2978557A (en) Electric switch incorporating an automatic circuit breaker
US2148880A (en) Automatic toggle joint cut-out switch
US2768262A (en) Electric cut-out switches
US2551397A (en) Electric circuit breaker
US2831093A (en) Switch
US2549441A (en) Electric switch operator
US3324263A (en) Safety tripping mechanism
US2956133A (en) Multipole circuit breaker
US2816192A (en) Electric switch incorporating an automatic circuit breaker
US2755358A (en) Shockproof overload relay
US2487534A (en) Manual reset sequential trip switch mechanism
US2809261A (en) Momentary contact switch
US2688675A (en) Electric circuit breaker
US2673267A (en) Electric circuit breaker
US3233055A (en) Snap action electrical switch with adjustable differential action
US2802080A (en) Circuit breaker